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Adapter designed in France by PreciAlpsIt's a lightest 104BCD adapter for Bafang BBS01 and BBS02 only 1.58ozThis is an extremely high quality!This spider, with the right gearing, allows you to increase your torque by over 33% when using a smaller chain ring. It's possible also to add a second gearCNC MachiningRaw material:Aluminium 6061